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Hymenopus coronatus

Hymenopus coronatus, also called H. bicornis, is a mantis from the rain forests of Southeast Asia. It is known by various common names including walking flower mantis and (pink) orchid mantis. It is one of several species known as flower mantises from their resemblance and behaviour.

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This species is characterized by brilliant coloring and a structure finely adapted for camouflage, mimicking parts of the orchid flower. The four walking legs resemble flower petals,[1] the toothed front pair being used as in other mantises for grasping prey.

H. coronatus shows some of the most pronounced sexual dimorphism of any species of mantis; males can be less than half the size of females.[2]

Cott quotes an account by Annandale of Hymenopus coronatus which he reports hunts on the flowers of the "Straits Rhododendron", Melastoma polyanthum. The nymph has what Cott calls "Special Alluring Coloration", where the animal itself is the "decoy". The insect is pink and white, with flattened limbs with "that semi-opalescent, semi-crystalline appearance that is caused in flower-petals by a purely structural arrangement of liquid globules or empty cells". The mantis climbs up and down the twigs of the plant until it finds one that has flowers. It holds on to these with the claws of its two rearmost pairs of legs. It then sways from side to side, and soon various small flies land on and around it, attracted by the small black spot on the end of its abdomen which resembles a fly. When a larger Dipteran fly, as big as a house fly, landed nearby, the mantis at once seized and ate it.[7][8]

A beautiful drawing of this rare insect, Hymenopus bicornis (in the nymph or active pupa state), was kindly sent me by Mr. Wood-Mason, Curator of the Indian Museum at Calcutta. A species, very similar to it, inhabits Java, where it is said to resemble a pink orchid. Other Mantidae, of the genus Gongylus, have the anterior part of the thorax dilated and coloured either white, pink, or purple; and they so closely resemble flowers that, according to Mr. Wood-Mason, one of them, having a bright violet-blue prothoracic shield, was found in Pegu by a botanist, and was for a moment mistaken by him for a flower. See Proc. Ent. Soc. Lond., 1878, p. liii.

The drawing was published in Edward Bagnall Poulton's book The Colours of Animals. Poulton calls it an "Indian Mantis" which "feeds upon other insects which it attracts by its flower-like shape and pink colour. The apparent petals are the flattened legs of the insect."[10]

The species is reported by Costa, quoting Shelford's 1903 account, to show parental care by guarding the eggs. Costa asks rhetorically "Why has so little [research] been done on parental care in mantids, such an unexpected and intriguing aspect of their behavior?"[11][12]

The camouflage of the orchid mantis probably deceives potential predators, as well as serving as aggressive mimicry of the orchid to help catch insect prey.[13]

The orchid mantis is said to be highly favoured by insect breeders, but rare and expensive.[14] The nymphs are described as "very inactive", requiring only a small space, but eating flying insects which they hunt by sitting and waiting. Up to 90 black and red nymphs may hatch from a single ootheca. Males are said to mature more rapidly than females unless cooled to 15–18 Celsius. Females grow most rapidly at temperatures between 30 and 55 Celsius with high humidity.[14]

^Annandale, Nelson (1900). "Notes on the Habits and natural Surroundings of Insects made during the 'Skeat Expedition' to the Malay Peninsula, 1899-1900". Proceedings of the Zoological Society of London: 837–868.